\documentclass[tikz,border=2mm]{standalone}
\usepackage{array,amsmath,mathptmx,xcolor,bbding,pifont,colortbl,amssymb}
\usepackage[UTF8]{ctex}
\newcolumntype{C}[1]{>{\centering\let\newline\\\arraybackslash\hspace{0pt}}m{#1}}
% 只需要这个就可以
\usepackage[thicklines]{cancel}

% 可以设置线条颜色，默认是黑色
\usepackage{xcolor}
\renewcommand{\CancelColor}{\color{red}} 
\usepackage{tikz-cd}
\usepackage{tikz,graphicx,subfig,caption} % Required for drawing custom shapes
\usetikzlibrary{fit,matrix,chains,arrows,shapes,positioning,arrows.meta,chains,shadows,shapes.callouts,decorations.text,shapes.symbols,shapes.misc, positioning,decorations.pathreplacing,calc}
\arrayrulecolor{red}
% 设置浅蓝色
\definecolor{lightblue1}{RGB}{175, 175, 237}
\definecolor{lightgreen1}{RGB}{226, 246, 186}
% 设定删除线颜色
\renewcommand{\CancelColor}{\color{red}}

\begin{document}
	\begin{tikzpicture}[>=latex,every node/.style={anchor=south west,inner sep=0}]
		
		%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
		\node[fill=white] at (5em,0) (SYNBL){
			\begin{tabular}[draw=red]{|C{16em}|} \hline
				%  行1
				\color{blue}FIRSTVT(A)$=$ $\left\{s_i|A\rightarrow s_i......\right\}$  \\ 
				% 行2
				\color{blue}LASTVT(A)$=$ $\left\{s_j|A\rightarrow ......s_j\right\}$ \\    \hline
			\end{tabular}
		};
		\node(point1) at ([xshift=-8em,yshift=0.1em]SYNBL.north) {\color{blue}设A$\in V_N$,$s_i,s_j$是两个文法符号；则：};
		\node(point2) at ([xshift=2.7em,yshift=-0.75em]SYNBL.north) {\color{blue}+};
		\node(point3) at ([xshift=2.5em,yshift=-1.8em]SYNBL.north) {\color{blue}+};
		
	\end{tikzpicture}
\end{document}